Key facts: Prosper
Two-story plans
In Windsong Ranch and similar communities, primary suites and laundries often sit upstairs. Work out what room is below each one, because that room takes the damage.[2] An attic air handler's clogged condensate line is a common summer culprit.
A closer look in Prosper

Clay and the foundation
Blackland clay shrinks when dry and swells when wet, so moisture near foundations matters.[3] In Star Trail and Gentle Creek, irrigation lines, pool fill valves and blocked patio drains can each look like a plumbing leak. Find the source before drying anything.
February 2021
DFW fell to −2°F and spent 139 straight hours at or below freezing.[4] Attic-routed lines in newer homes were exposed. Know where your main shutoff is before the next one.
Flood claims recorded in Collin County
Prosper sits in Collin County. FEMA publishes every National Flood Insurance Program claim with personal details removed, which gives a plain record of where water has reached insured buildings here.
| Measure | Count |
|---|---|
| Flood insurance claims on record | 357 |
| Year with the most claims | 2015 (48) |
| Largest named event | Flooding (40) |
| Claims outside high-risk A and V zones | 62% |
| Claims on buildings built before 1975 | 30% |
County-wide counts of insured claims only. Uninsured losses, burst pipes and appliance leaks are not in this data.
What the Prosper claim record shows
For Prosper homes, the local precedents are the events behind the most Collin County claims: Flooding (40 claims), Early Summer Storms (27 claims) and Early Summer Severe Storms (7 claims).
About 62% of claims with a recorded zone came from outside the high-risk A and V zones, so a moderate-risk label does not mean a Prosper home stays dry.
A newer Prosper home is not exempt: 70% of claims with a known build date involved homes built in 1975 or later.
Federal disaster history for Collin County
FEMA lists 20 federal declarations covering Collin County. The most common types are hurricane (5), severe storm (4) and fire (3). The latest are Severe Storms, Straight-Line Winds, Tornadoes, and Flooding in 2024, Severe Winter Storms in 2021 and Severe Winter Storm in 2021. Federal aid can open after a declaration, so Prosper owners should look it up before discarding damaged items.
Prosper weather and your home
Weather records for Prosper from 2015 through 2024 average 54 inches of precipitation a year, and May and October are the wettest months. The area averages 14.3 days a year with an inch or more.
Prosper falls to 20°F or below on about 3 nights a year, which puts pipes in exterior walls, crawl spaces and garages at risk.
With about 77 days a year at 90°F or hotter, Prosper air conditioners run hard, and a clogged condensate line can soak a ceiling without warning.
When rain falls in Prosper
Seasonal averages for Prosper, 2015 through 2024. Plan roof, gutter and sump pump checks before the wettest stretch.
| Season | Average | Share of year |
|---|---|---|
| January to March | 11.9 in | 22% |
| April to June | 17.9 in | 33% |
| July to September | 10.3 in | 19% |
| October to December | 13.6 in | 25% |
Modeled from Open-Meteo historical weather data. Precipitation includes rain and melted snow.
Prosper home checklist from these records
- Don't rely on recent quiet years. Only 36% of Collin County claims date from 2015 or later, so older floods still show what can happen.
- Insulate exposed pipes before 3-plus hard-freeze nights arrive, and know your main shutoff.
- Test any sump pump before May, since Prosper averages 14 days a year with an inch or more.
- Clear the air conditioner drain line before the 77 days of 90°F heat begin.
- Keep dated photos of each room. After Flooding, 40 insured Collin County owners filed claims at about the same time.
What to tell the Prosper contractor
- Your neighborhood
- Which floor the leak is on
- Whether the home has a pool or irrigation
Services Prosper callers ask about
Sources and citations
- [1]Wikipedia: Prosper, Texas
- [2]D Magazine: Prosper's Windsong Ranch has new owners
- [3]Wikipedia: Texas blackland prairies
- [4]National Weather Service Fort Worth: February 2021 winter event
- [5]TDLR: Mold assessors and remediators FAQ
- [6]Town of Prosper: Building Inspections
- [7]OpenFEMA: FIMA NFIP redacted claims
- [8]OpenFEMA: Disaster declarations summaries
- [9]Open-Meteo: Historical weather API

